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On Saturday Derek picked pears from 32 trees. His picked average of 17 pears per tree. Sunday he picked more pears averaging 12 pears per tree. Over the whole weekend he picked an average of 14 pears per tree. How many trees did Derek pick from on Sunday? Please help with this question. I can't seem to get the right answer although I know it has something to do with the mean. Thanks

  • Maths -

    It has to do with the mean, in that the total pears picked on a day is the number of trees times the average picked per tree.

    If he picked n trees on Sunday, his total pear count is

    32*17 + n*12 = (32+n)*14
    n = 48

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